public override AnswerMessage GetSolution(long first, long second)
{
if (first * second <= 100)
{
return(null);
}
if (first == 9)
{
var temp = second * Ten;
var solution = $"{first} × {second} = {Ten} × {second} - {second} = {temp} - {second} = ";
return(new AnswerMessage(AppResources.Multiplication9Message, solution));
}
if (second == 9)
{
var temp = first * Ten;
var solution = $"{first} × {second} = {first} × {Ten} - {first} = {temp} - {first} = ";
return(new AnswerMessage(AppResources.Multiplication9Message, solution));
}
if (first == 11)
{
var temp = second * Ten;
var solution = $"{first} × {second} = {Ten} × {second} + {second} = {temp} + {second} = ";
return(new AnswerMessage(AppResources.Multiplication11Message, solution));
}
if (second == 11)
{
var temp = first * Ten;
var solution = $"{first} × {second} = {first} × {Ten} + {first} = {temp} + {first} = ";
return(new AnswerMessage(AppResources.Multiplication11Message, solution));
}
if (first == 2)
{
return(Plus.GetSolution(second, second));
}
if (second == 2)
{
return(Plus.GetSolution(first, first));
}
if (first == 5)
{
if (second % 2 == 0)
{
var solution = $"{first} × {second} = {Ten} × ({second} ÷ {2}) = ";
return(new AnswerMessage(AppResources.Multiplication5_2Message, solution));
}
var solution2 = $"{first} × {second} = {Ten} × {second} ÷ {2} = ";
return(new AnswerMessage(AppResources.Multiplication5Message, solution2));
}
if (second == 5)
{
if (first % 2 == 0)
{
var solution = $"{first} × {second} = {first} ÷ {2} × {Ten} = ";
return(new AnswerMessage(AppResources.Multiplication5_2Message, solution));
}
var solution2 = $"{first} × {second} = {first} × {Ten} ÷ {2} = ";
return(new AnswerMessage(AppResources.Multiplication5Message, solution2));
}
if (first == 25)
{
if (second % 4 == 0)
{
var solution = $"{first} × {second} = {100} × ({second} ÷ {4}) = ";
return(new AnswerMessage(AppResources.Multiplication25_4Message, solution));
}
var solution2 = $"{first} × {second} = {100} × {second} ÷ {4} = ";
return(new AnswerMessage(AppResources.Multiplication25Message, solution2));
}
if (second == 25)
{
if (first % 4 == 0)
{
var solution = $"{first} × {second} = {first} ÷ {4} × {100} = ";
return(new AnswerMessage(AppResources.Multiplication25_4Message, solution));
}
var solution2 = $"{first} × {second} = {first} × {100} ÷ {4} = ";
return(new AnswerMessage(AppResources.Multiplication25_4Message, solution2));
}
if (first == 4)
{
var solution = $"{first} × {second} = {2} × {second * 2} = ";
return(new AnswerMessage(AppResources.Multiplication4Message, solution));
}
if (second == 4)
{
var solution = $"{first} × {second} = {first * 2} × {2} = ";
return(new AnswerMessage(AppResources.Multiplication4Message, solution));
}
if (first == 8)
{
var solution = $"{first} × {second} = {2} × {second * 2} = {2} × {second * 2 * 2} = ";
return(new AnswerMessage(AppResources.Multiplication8Message, solution));
}
if (second == 8)
{
var solution = $"{first} × {second} = {first * 2} × {2}= {first * 2 * 2} × {2} = ";
return(new AnswerMessage(AppResources.Multiplication8Message, solution));
}
if (first < 10)
{
var secondArray = NumberToArray(second);
var list = new List <string>(secondArray.Count + 1)
{
$"{first} × {second} = "
};
for (var i = secondArray.Count - 1; i >= 0; i--)
{
var b = secondArray.Count - 1 >= i ? secondArray[i] * Math.Pow(10, i) : 0;
var s = i != 0 ? $"{first} × {b} + " : $"{first} × {b} = ";
list.Add(s);
}
var solution = string.Concat(list);
return(new AnswerMessage(AppResources.MultiplicationMultyOneMessage, solution));
}
if (second < 10)
{
var firstArray = NumberToArray(first);
var list = new List <string>(firstArray.Count + 1)
{
$"{first} × {second} = "
};
for (var i = firstArray.Count - 1; i >= 0; i--)
{
var b = firstArray.Count - 1 >= i ? firstArray[i] * Math.Pow(10, i) : 0;
var s = i != 0 ? $"{b} × {second} + " : $"{b} × {second} = ";
list.Add(s);
}
var solution = string.Concat(list);
return(new AnswerMessage(AppResources.MultiplicationMultyOneMessage, solution));
}
if (first > 10 && second > 10)
{
var secondArray = NumberToArray(second);
var capacity = secondArray.Count + 1;
var list = new List <string>(capacity)
{
$"{first} × {second} = "
};
for (var i = secondArray.Count - 1; i >= 0; i--)
{
var pow = Math.Pow(10, i);
var b = secondArray.Count - 1 >= i ? secondArray[i] * pow : 0;
var s = i != 0 ? $"{first} × {b / pow} × {pow} + " : $"{first} × {b} = ";
list.Add(s);
}
var solution = string.Concat(list);
return(new AnswerMessage(AppResources.MultiplicationMultyMessage, solution));
}
return(null);
}